The invention discloses a chamfered upright eccentric butterfly valve device. The chamfered upright eccentric butterfly valve device comprises a positive-cone upright butterfly valve and a driving assembly which is connected to the positive-cone upright butterfly valve. The positive-cone upright butterfly valve comprises a valve seat, a valve core, a rotating shaft and a sealing assembly. The valve seat is provided with a valve hole. The inner wall surface of the valve hole is at least partially provided with an inner positive conical surface, and the cross-sectional contour line perpendicularto the centerline of the valve hole is circular. The rotating shaft is rotatably connected to the valve seat. The valve core is mounted on the valve hole. The outer side wall of the valve core is provided with an outer positive conical surface. A preset eccentric distance is formed between the center line of the valve core and the rotating center line of the rotating shaft. The center line of thevalve core coincides with the axis of the valve hole. The rotating shaft drives the valve core to rotate. The valve core opens the valve hole, or the outer positive conical surface of the valve coreis sealed and attached to the inner positive conical surface of the valve hole. The matching surface of the valve seat and the valve core is arranged as a positive conical surface, the machining precision is high, and the universality is good.